3 years ago

Verify cos^4x-sin^4x=cos2x

Mathematics

1 answer:

kati45 [8]3 years ago

7 0

A^2 - b^2 = (a - b)( a +b);
<span>cos^4x-sin^4x =( cos^2x + sin^2x )( cos^2x - sin^2x) = 1* cos2x = co2x.</span>

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